1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <linux/dma-buf-map.h> 4 5 #include <drm/drm_atomic.h> 6 #include <drm/drm_atomic_helper.h> 7 #include <drm/drm_fourcc.h> 8 #include <drm/drm_gem_atomic_helper.h> 9 #include <drm/drm_gem_framebuffer_helper.h> 10 #include <drm/drm_plane_helper.h> 11 #include <drm/drm_gem_shmem_helper.h> 12 13 #include "vkms_drv.h" 14 15 static const u32 vkms_formats[] = { 16 DRM_FORMAT_XRGB8888, 17 }; 18 19 static const u32 vkms_cursor_formats[] = { 20 DRM_FORMAT_ARGB8888, 21 }; 22 23 static struct drm_plane_state * 24 vkms_plane_duplicate_state(struct drm_plane *plane) 25 { 26 struct vkms_plane_state *vkms_state; 27 struct vkms_composer *composer; 28 29 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 30 if (!vkms_state) 31 return NULL; 32 33 composer = kzalloc(sizeof(*composer), GFP_KERNEL); 34 if (!composer) { 35 DRM_DEBUG_KMS("Couldn't allocate composer\n"); 36 kfree(vkms_state); 37 return NULL; 38 } 39 40 vkms_state->composer = composer; 41 42 __drm_atomic_helper_plane_duplicate_state(plane, 43 &vkms_state->base); 44 45 return &vkms_state->base; 46 } 47 48 static void vkms_plane_destroy_state(struct drm_plane *plane, 49 struct drm_plane_state *old_state) 50 { 51 struct vkms_plane_state *vkms_state = to_vkms_plane_state(old_state); 52 struct drm_crtc *crtc = vkms_state->base.crtc; 53 54 if (crtc) { 55 /* dropping the reference we acquired in 56 * vkms_primary_plane_update() 57 */ 58 if (drm_framebuffer_read_refcount(&vkms_state->composer->fb)) 59 drm_framebuffer_put(&vkms_state->composer->fb); 60 } 61 62 kfree(vkms_state->composer); 63 vkms_state->composer = NULL; 64 65 __drm_atomic_helper_plane_destroy_state(old_state); 66 kfree(vkms_state); 67 } 68 69 static void vkms_plane_reset(struct drm_plane *plane) 70 { 71 struct vkms_plane_state *vkms_state; 72 73 if (plane->state) 74 vkms_plane_destroy_state(plane, plane->state); 75 76 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 77 if (!vkms_state) { 78 DRM_ERROR("Cannot allocate vkms_plane_state\n"); 79 return; 80 } 81 82 plane->state = &vkms_state->base; 83 plane->state->plane = plane; 84 } 85 86 static const struct drm_plane_funcs vkms_plane_funcs = { 87 .update_plane = drm_atomic_helper_update_plane, 88 .disable_plane = drm_atomic_helper_disable_plane, 89 .destroy = drm_plane_cleanup, 90 .reset = vkms_plane_reset, 91 .atomic_duplicate_state = vkms_plane_duplicate_state, 92 .atomic_destroy_state = vkms_plane_destroy_state, 93 }; 94 95 static void vkms_plane_atomic_update(struct drm_plane *plane, 96 struct drm_atomic_state *state) 97 { 98 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, 99 plane); 100 struct vkms_plane_state *vkms_plane_state; 101 struct drm_framebuffer *fb = new_state->fb; 102 struct vkms_composer *composer; 103 104 if (!new_state->crtc || !fb) 105 return; 106 107 vkms_plane_state = to_vkms_plane_state(new_state); 108 109 composer = vkms_plane_state->composer; 110 memcpy(&composer->src, &new_state->src, sizeof(struct drm_rect)); 111 memcpy(&composer->dst, &new_state->dst, sizeof(struct drm_rect)); 112 memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer)); 113 drm_framebuffer_get(&composer->fb); 114 composer->offset = fb->offsets[0]; 115 composer->pitch = fb->pitches[0]; 116 composer->cpp = fb->format->cpp[0]; 117 } 118 119 static int vkms_plane_atomic_check(struct drm_plane *plane, 120 struct drm_atomic_state *state) 121 { 122 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, 123 plane); 124 struct drm_crtc_state *crtc_state; 125 bool can_position = false; 126 int ret; 127 128 if (!new_plane_state->fb || WARN_ON(!new_plane_state->crtc)) 129 return 0; 130 131 crtc_state = drm_atomic_get_crtc_state(state, 132 new_plane_state->crtc); 133 if (IS_ERR(crtc_state)) 134 return PTR_ERR(crtc_state); 135 136 if (plane->type == DRM_PLANE_TYPE_CURSOR) 137 can_position = true; 138 139 ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state, 140 DRM_PLANE_HELPER_NO_SCALING, 141 DRM_PLANE_HELPER_NO_SCALING, 142 can_position, true); 143 if (ret != 0) 144 return ret; 145 146 /* for now primary plane must be visible and full screen */ 147 if (!new_plane_state->visible && !can_position) 148 return -EINVAL; 149 150 return 0; 151 } 152 153 static int vkms_prepare_fb(struct drm_plane *plane, 154 struct drm_plane_state *state) 155 { 156 struct drm_gem_object *gem_obj; 157 struct dma_buf_map map; 158 int ret; 159 160 if (!state->fb) 161 return 0; 162 163 gem_obj = drm_gem_fb_get_obj(state->fb, 0); 164 ret = drm_gem_shmem_vmap(gem_obj, &map); 165 if (ret) 166 DRM_ERROR("vmap failed: %d\n", ret); 167 168 return drm_gem_plane_helper_prepare_fb(plane, state); 169 } 170 171 static void vkms_cleanup_fb(struct drm_plane *plane, 172 struct drm_plane_state *old_state) 173 { 174 struct drm_gem_object *gem_obj; 175 struct drm_gem_shmem_object *shmem_obj; 176 struct dma_buf_map map; 177 178 if (!old_state->fb) 179 return; 180 181 gem_obj = drm_gem_fb_get_obj(old_state->fb, 0); 182 shmem_obj = to_drm_gem_shmem_obj(drm_gem_fb_get_obj(old_state->fb, 0)); 183 dma_buf_map_set_vaddr(&map, shmem_obj->vaddr); 184 drm_gem_shmem_vunmap(gem_obj, &map); 185 } 186 187 static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = { 188 .atomic_update = vkms_plane_atomic_update, 189 .atomic_check = vkms_plane_atomic_check, 190 .prepare_fb = vkms_prepare_fb, 191 .cleanup_fb = vkms_cleanup_fb, 192 }; 193 194 struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev, 195 enum drm_plane_type type, int index) 196 { 197 struct drm_device *dev = &vkmsdev->drm; 198 const struct drm_plane_helper_funcs *funcs; 199 struct drm_plane *plane; 200 const u32 *formats; 201 int ret, nformats; 202 203 plane = kzalloc(sizeof(*plane), GFP_KERNEL); 204 if (!plane) 205 return ERR_PTR(-ENOMEM); 206 207 if (type == DRM_PLANE_TYPE_CURSOR) { 208 formats = vkms_cursor_formats; 209 nformats = ARRAY_SIZE(vkms_cursor_formats); 210 funcs = &vkms_primary_helper_funcs; 211 } else { 212 formats = vkms_formats; 213 nformats = ARRAY_SIZE(vkms_formats); 214 funcs = &vkms_primary_helper_funcs; 215 } 216 217 ret = drm_universal_plane_init(dev, plane, 1 << index, 218 &vkms_plane_funcs, 219 formats, nformats, 220 NULL, type, NULL); 221 if (ret) { 222 kfree(plane); 223 return ERR_PTR(ret); 224 } 225 226 drm_plane_helper_add(plane, funcs); 227 228 return plane; 229 } 230